445eceb02a
Part of https://projects.blender.org/blender/blender/pulls/141278 Blend files compatibility: If a World exists and "Use Nodes" is disabled, we add new nodes to the existing node tree (or create one if it doesn't) that emulates the behavior of a world without a node tree. This ensures backward and forward compatibility. Python API compatibility: - `world.use_nodes` was removed from Python API => **Breaking change** - `world.color` is still being used by Workbench, so it stays there, although it has no effect anymore when using Cycles or EEVEE. Python API changes: Creating a World using `bpy.data.worlds.new()` now creates a World with an empty (embedded) node tree. This was necessary to enable Python scripts to add nodes without having to create a node tree (which is currently not possible, because World node trees are embedded). Pull Request: https://projects.blender.org/blender/blender/pulls/142342
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